add reference

cmake/generic.cmake

@@ -24,6 +24,10 @@
 # cc_binary  	 nv_binary	  go_binary
 # cc_test        nv_test	  go_test
 # -------------------------------------------
+#
+# cmake_parse_arguments can help us to achieve this goal.
+# https://cmake.org/cmake/help/v3.0/module/CMakeParseArguments.html
+
 
 # cc_binary parses tensor.cc and figures out that target also depend on tensor.h.
 # cc_binary(tensor